Mechanism fob gbading aggbegates



L. w. BEAVE N. I

MECHANISM-FOR GRADING 'AGGREGATES.

- APPLICATION men JAN-29, 1919. I

- Patented Feb. 15, 1.921.

INVENTOR 7 TTolha Y5.

L.,W. B EAVEN. MECHANISM FOR GRADING AGGREGATES.

APPLICATION FILED IAN-29. 1919. 1,368,422. Patented Feb. 15,1921.

' 4 SHEETS-SHEET 2- [N VENTOR [635519 weaven.

AT RNE L. w. BEAYEN. MECHANISM FOR GRADINGAGGREGATES.

. I APPLICATION FILED JAN. 29, 1919: 1,368,422. Patented Feb. 15, 1921'.

Zai 60,15 ewe/Z.

- 'UNlTED STATESPAYTENT- Q LESLIE w- B AVER. or onica'e'o,'I L LI oIs.

MECHANISM- r011 GRADING, aoennea'rns.

To all whom it may concern: Be it known that I, LESLIE nisms forGradingAggregateaof which the following is a specification. a g

Gravel and coarse andfin'e sand employed. 1n building operatlons aregenerallyfound in nature commingled, and in" order to ob tain properproportions, of. these'respective materials for building operations, itis first 'acters are employed throughout the several vlews to designatethe same parts.

necessary to grade or separatethem so that the desired proportions maybetaken. At present, so far as I am aware, the grading of these materialsinvolves the employment of aconsiderable amountof machinery and theaction of the aggregates upon the screens used for their grading orseparation is exceedingly destructive to the machinery mployed. Also thepresence of moisture in the materials to be graded creates a considerable amount of cohesion between the particles of the material whichinterferes with the grading operation unless thematerial has first beendried. I

My present invention relates to the provision of apparatus forseparating orfgr'ading aggregates, and has for its particular object theelimination of mechanical separating machinery; the lessening'of thewear upon the gradlng machinery; and the elimination of cohesion betweenthe particles of the material to. be graded, 'which would otherwiseinterfere with the grading opera- I tion. I prefer to attain, theforegoing ob jects by means of the structure diagram-j inaticallyillustrated in the accompanying drawings, in which,

. Figure 1 1s a side elevation of a structure,

embodying my invention.

7 Fig. 2 1s a longitudinal central section 'of' the grading tank. i

Fig. 3 is a transverse section taken on line l vals with blocks of metal'18, that arese- 3-3, of Fig. 2. I a

Fig. 4: is a fragmental plan ofthe upper grading plate and its support.

Fig. 6 isa fragmental elevation of the I projectd above said shelves.

shelf for supporting the grading elements.

Fig. 7 is .a longitudinal section taken on a W. BnAvnN, a citizen of theUnited States, and a resident p atio of r Patented Feb. 15, 1921.Application filed January 29, 1919/ serial No. 273,815.

' Fi 8 is a longitudinal sectiontaken on line 8 ,8,' of Fig. 2.

Fig. 9a a detail View of a discharge head. f Fig. 10 is a'fragmentaldetail of the end of a discharge pipe showing thegagefor indicating therate of discharge therefrom.

Fig. l l is afragmental view of the "discharge end of the grading tank,as shown in Fig. 1, but with the discharge conduits 'ar- 1 ranged at adifferent angle or grade from that shown n Fig.1 in order to'cont'rolthe flow or discharge therethrough'.

In the drawings 1 similarlreference char- The grading apparatuscomprises a tank or compartment 10, which I have shown as length and ofan inside diameter of forty (40'?) inches. 'Of course, these dimensions"maybe either increased or diminished in accordance with the capacity ofthe'apparatus whichitis desired to construct, withalso be alteredwithout altering the modeflof operation. Around both ends of thispipeare riveted rings 11 of angle metal so as to provide the: annularflanges 12, which are out in'any way departing from-the prin- 'ciples ormode; ofoperation, and the form of apparatus herein shown and describedmay bored atsuitable intervals for the passage heads, 14 and 15,respectively, to theopen endsof saidcompartment. Securedldiamet ricallyopposite each other and approxi- .of. bolts 13 for securing the upperand lower posedstrips of angle metal 16, 16, which extend fromend'to endof the compartment, I

substantially parallel to each other, and have one flange of each pieceof angle metal extending radially toward the center of-thecompartment'to provide shelves 17. These shelves 17 are reinforced atsuitable intercuredto the under faces thereof by riveting,

. welding, sweating, or in any other suitable section "consisting of aplate 20 bored along I its longitudinal edges for the passage of thestuds 19 and perforated throughout its central portion with holes 21,approximately three-eighths of an inch in diameter, to form areticulated or screening area, is supported upon the shelves 17 andsecured thereto by nuts 22 which screw down upon the threaded studs 19.

Instead of employing the perforated plates above described, such ascreen as is shown in Fig. 5 may be employed. This screen, known as agrisley or bar, consists of longitudinal parallel bars or rods 23, setthe requisite distance apart, in this instance about three-eighths of aninch, and are provided with transverse braces 2a, preferablyelectrically weldedto the under sidesjof the longitudinal bars 23. Thisgrisley or bar screen is preferably V mesh, and the remaining two-thirdsplates which, together with the mountedin a frame 25 of properdimensions, which is bored at suitable intervals for the passage of thestuds 19. Also other varieties of screening elements than hereindescribed may be employed, if desired. 7

Preferably halfway between the shelves 17 and the bottom of thecompartment, are provided similar shelves 26 that are formed of anglemetal pieces 27, and in other respects are similar to the shelves 17.The third of the shelves26 adjacent the feed or inlet endof thecompartment supports a frame 28 in which is mounted a screen 29 ofmetallic fabric, of asize known as 20- of the metal frame shelving 26carries unperforated and screen, 28 and 29, divide the space helow theupper or coarse screen into two'superposed passageways 31 and 32. Theframe 28 and the plates 30 are secured upon the .shelves 26 in a mannersimilar to that emit is'desired that a greater or less proportion of thefiner or what is known as bank sand is to be removed from the coarsesand. It

is also apparent that while I have described the employment of threepassageways, the number of passageways may be either increased ordecreased without in any way modifying the method of operation,thenumber of passageways being determined by the number of differentgrades into which it is desiredto separate the aggregates.

The entire compartment or tank 10 is preferably inclined at an angle ofsubstantially forty (40) degrees to the horizontal,

. as illustrated in Fig. 1, and the upper end per coarse screen 20, isan inlet stub 34 adapted to be connected, through an elbow 35, with apipe or conduit from a hydraulic dredging machine. The head 14 hasriveted to its inner face two parallel strips 36 and 37 of angle metal,the outstanding flanges of which are adapted to extend just above thecoarse screen 20 and the mesh frame 28, respectively.

To the lower end of the tank 10 is bolted a closure 15, of the taperedor conical form shown in Fig. 9, terminating in the three dischargeopenings 39, l0, and d1, communicating, respectively, with the portionof the tank above the coarse screen, the passageway 31 between thescreens, and the passageway 32 below the lower screen and unperforatedplates. Secured to each of the discharge openings 39, 4:0, and 41, arelengths of pipe or conduit, 42, &3, and 4a, which extend upwardlyat'substantially a forty-five (@5") degree angle to a point preferablyabove the horizontal plane of the highest interior point in the tank 10,and are then separated and extended to suitable places for thedeposition and storage of the graded materials. It, of course, will beappreciated that the rate of flow through the compartment 10, as well asthe level of the fluid therein, can be controlled by either the heightto which the outlet conduits are carried or the amount of grade that isgiven to the outlet conduits, or the length to which the conduits areextended. In practice all three of these conditions are utilized and, asit is desirable to maintain the discharge from each outlet conduit atrelatively the same head, I have provided means for ascertaining therate of flow from the discharge ends of the conduits which areillustrated in Fig. 10 of the drawings. This means consists in securingto the end of each discharge conduit a flange nipple 457, provided witha lateral stub 48 into which a vertically disposed graduated glass tube49 is secured by means of the usual gland nut 50 and suitable packing.rises in the tube 4E9 will depend upon the rate of flow from the outletconduit and a comparison of a reading of the on the respective outletconduits will immediately disclose the relation of the discharges fromthe several conduits; The closure 15 is preferably a casting ofmanganese or other hard steel, which is best adapted towithstand theabrasion caused the passage of the aggregates in transit therethrough. i

From the highest part of the tank 10 extends an air-pipe d5 which iseither carried above the highest point to which the head employed in thesystem would carry the water, or is provided with an air-cock 46 bymeans of which air can be released from the interior of the tank.

In operating this device water is pumped into the tank through" theLiiilet stub 34 until the air has been completely expelled and the tankis full and water flowing from the pipes 42, 43, and 44, then aggregatesand water are permitted to enter. All material which cannot pass throughthe coarse screen is carried by the flow of water through the dischargeopening 39 and the pipe 42 to o the desired point for the receiptandstorage of this grade of material. All of the aggregates which passthrough the coars'e screen It will be noted that the entire gradingoperation takes place under water where the material is lightened to theextent "of the weight of the volume of water displaced thereby and wherethe cohesion created by moisture is entirely eliminated by the presenceof an excess quantity of'water. In this manner the grading or screeningof the material is greatly facilitated and the wearing of the machineryis greatly reduced through the lightening of the materials and throughthe lubricating qualities of the water present.

It should also be noted that the rate of travel. of the materials, whichis very important in g the operation of grading, is controlled,primarily, by the relative cross-section-of the securing tank andsupply-pipe, and, secondarily, by the head or flow of water emplo'yed,and that the entire conveyance of the materials is accomplished without'the use of any mechanical conveying mechanism except the dredge pipesand the water carried thereby.

While I have illustrated and described certain instrumentalities forcarrying out my 1nvent1on and have deslgnated certain proportions anddimensions in connection therewlth, it will be ObVlOHS to personsskilled in'the art that divers changes and modifications may be'madewithout, affecting.

the principles involved. Y I therefore desire it understood that allsuch changes are'con templatedas within the scope of the appendedclaims. 1

What I:claim is 1. A grading mechanism comprising. a

compartment adapted to receive aggregates and water under pressure, saidcompartment being divided intosuperposed passageways, an inlet portlocated in theupper most of said passageways, screening, ele-' mentslocated in the division wallsbetween said passageways, and separateoutlet conduits leading from each of saidfpassage proper point foritsrewithinsaid "compartment at a ways' adapted to-conductthedischargeof water and aggregates therethrough to' a point adjacent thelevelbf the highest in-' terior point within said compartment.

2. A grading device. comprising a compartment. adapted'to receiveaggregates and water under pressure, said compartment being divided intosuperposed passageways,

an inlet portlocated 1n the uppermost oi said passageways, screeningelements located 1n the division walls between said passageways,

andseparate outlet conduits leading from each of said passagewaysadaptedto conduct the dischargeof water and aggregates therethrough to apoint adjacent the level of the highest point'within said compartmentand extending from thence'to the desired point for, the discharge ofthematerials carried byleach conduit. I

3. A grading device, comprising a; compartment forthe reception of amixture of water and aggregates, said compartment being divided, intosuperposed passagecated in the divisionwalls between said passageways,and separate outlet conduits leadi ing from each ofsaid passagewayswhereby the water level within said'compartment is maintained above "thelevel of the highest point of'said screening elements.

'ways, an inlet port located in the uppermost of said passageways,screening elements 10- 4. A grading device comprising a com partment forthe reception of a mixture of water and aggregates, said compartmentbeingdivided into superposed passageways,

sageways, separate outlet conduits leading from each of said passagewas, andmeans for controlling-the dlscharge rom said com- 1 partment so asto maintain the water level within said ompartment above the highestpoint of said screening elements.

5. A grading 'mechanism comprising a compartment for the reception'of amixture jotwater and aggregates, said compartment being divided intosuperposed passageways, aninlet port located in the uppermost of saidpassageways, screening elements located in the division walls'betweensaid passageways,

separate outlet ports leading from each of said passageways, and meansfor controllin ,the flow through and discharge from sai passagewayssodas to maintain the water desired velocity of flow and level.

'6. A mechanism for grading aggregates comprisinga conduit through whichaggre gates and water'are adapted to be pumped under pressure, acompartment of larger sectional capacity than, the first ortion of saidconduit interposed in and orming a portion thereof whichcompartmentreduces the rate of flow of materials therethrough so aninlet port located in the uppermost of said passageways; screeningelements lo--- ,cated 111 the division walls between said as as topermit the gravitation thereof, grading elements disposedwithin saidcompartment and discharge conduits of lesser combined capacity than saidcompartment whereby the rate of flow through said discharge conduits isincreased to a point to carry said aggregate.

Signed at Chicago, county of Cook and State of I11inois,.this 21st dayof January,

7 LESLIE W. BEAVEN.

Witnesses: I ROLAND E. WILcox, V

BEN T. RooDHoUsm

